package com.nowcoder.community.controller;

import com.google.code.kaptcha.Producer;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.utils.CommunityConstant;
import com.nowcoder.community.utils.CommunityUtil;
import com.nowcoder.community.utils.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;

import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Controller
public class LoginController implements CommunityConstant {

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private RedisTemplate redisTemplate;

    @GetMapping("/register")
    public String getRegisterPage() {
        return "/site/register";
    }

    @GetMapping("/login")
    public String getLoginPage() {
        return "/site/login";
    }

    @PostMapping("/register")
    public String register(Model model, User user) {
        Map<String, Object> map = userService.register(user);
        if (map == null || map.isEmpty()) {
            model.addAttribute("msg", "注册成功，我们已经向您的邮箱发送了一封激活邮件，请尽快激活！");
            model.addAttribute("target", "/index");

            return "/site/operate-result";
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            return "/site/register";
        }
    }


    @GetMapping("/activation/{userId}/{code}")
    public String activation(Model model, @PathVariable("userId") int userId,
                             @PathVariable("code") String code) {
        int result = userService.activation(userId, code);
        if (result == ACTIVATION_SUCCESS) {
            model.addAttribute("msg", "激活成功，您的账号已经可以正常使用了！");
            model.addAttribute("target", "/login");

        } else if (result == ACTIVATION_REPEAT) {
            model.addAttribute("msg", "无效的操作，该账号已经激活过！");
            model.addAttribute("target", "/index");
        } else {
            model.addAttribute("msg", "激活失败，您提供的激活码不正确！");
            model.addAttribute("target", "/index");
        }

        return "/site/operate-result";
    }

    @GetMapping("/kaptcha")
    public void getKaptcha(HttpServletResponse response, HttpSession session) {
        // 生成验证码
        String text = kaptchaProducer.createText();
        BufferedImage image = kaptchaProducer.createImage(text);

        // 将验证码存在session中
        // session.setAttribute("kaptcha", text);

        // 验证码的归属
        String kaptchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner", kaptchaOwner);
        cookie.setMaxAge(60);
        cookie.setPath(contextPath);
        response.addCookie(cookie);
        // 将验证码存入redis
        String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        redisTemplate.opsForValue().set(redisKey, text, 60, TimeUnit.SECONDS);

        // 将图片输出給浏览器
        response.setContentType("image/png");
        try {
            OutputStream os = response.getOutputStream();
            ImageIO.write(image, "png", os);

        } catch (IOException e) {
            logger.error("响应验证码失败：" + e.getMessage());
        }
    }

    /*
     * @param username: 用户名
     * @param password: 密码
     * @param code: 验证码
     * @param rememberme: 是否记住用户
     * @param model: 视图模型，负责显示处理后的页面数据
     * @param session: 存储生成的登录凭证
     * @param response: 返回cookie给浏览器
     * @return String: 返回的页面
     */
    @PostMapping("/login")
    public String login(String username, String password, String code, boolean rememberme,
                        Model model, /*HttpSession session, */ HttpServletResponse response,
                        @CookieValue("kaptchaOwner") String kaptchaOwner) {
        // 1.检查验证码
        // String kaptcha = (String) session.getAttribute("kaptcha");
        String kaptcha = null;
        if (StringUtils.isNoneBlank(kaptchaOwner)) {
            String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
            kaptcha = (String) redisTemplate.opsForValue().get(redisKey);
        }

        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !code.equalsIgnoreCase(kaptcha)) {
            model.addAttribute("codeMsg", "验证码不正确！");
            return "/site/login";
        }

        // 2.检查用户名和密码
        // 是否记住，记住则增加的登录凭证存在的时间
        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String, Object> map = userService.login(username, password, expiredSeconds);
        if (map.containsKey("ticket")) { // 存在ticket，则将其存入到cookie中
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSeconds);
            response.addCookie(cookie);
            // 登录成功，回到首页
            return "redirect:/index";
        } else { // 否则，回到当前页面
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            return "/site/login";
        }
    }

    @GetMapping("/logout")
    public String logout(@CookieValue("ticket") String ticket) {
        userService.logout(ticket); // 登出
        SecurityContextHolder.clearContext(); // 清除凭证
        return "redirect:/login"; // 重定向到登录界面
    }
}
